1. Center for Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
2. Penn State Greater Allegheny, McKeesport, Pennsylvania 15132, United States
3. Rosenstiel School of Marine and Atmospheric Science (RSMAS)/Marine and Atmospheric Chemistry (MAC), University of Miami, Miami, Florida 33149, United States
4. United States Air Force Research Laboratory, Wright Patterson Air Force Base, Dayton, Ohio 45460, United States